Unless you have a dedicated track or racecar, there is no need to change out the Ate fluids on a quarterly basis. It may make sense for a track or race car because the fluid can absorb enough moisture to lower the boiling point. On a street car you can run it like ordinary brake fluid.

In over ten years of track events and racing, including 13 hour races, I have never had a spongy pedal with the Ate fluids.

Thank you for the valuable experience sharing and info!
So you're saying theoretically I can leave the ATE fluid in longer?
That info about it compromising DSC /ABS related functionality has me a little concerned though.
I would think the dealer would not be foolish enough to put a fluid in or perform any work that could potentially invite liability, no?